Mechanical stoker for furnaces.



F. W.. SEYBOTE.

' MECHANICAL STOKEB FOR FURNACES. APPLICATION I'ILED MAY 14, 1909.

Patented Nov. 9, 1909.

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939,869, I Fig.1. q

FR\EDRCHWILHELM SEYBOTH,

ATTO RN EY.

ANDREW B. GRAHAM b0. mlovp-umuumwnans. WASHINGTON, n. c

Invaniar F. W; SEYBOTH.

MEGHANIGAL STOKER FOR FURNACES. APPLICATION FILED MAY 14, 1909.

Patented Nov. 9, 1909.

'l SHEETS-SHEET 2.

Invani or: fiuenglcn W1 LHELMSEY BOTH.

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Attorngy F. W. SEYBOTH. MECHANICAL STOKER FOR FURNACES. APPLICATIONFILED MAY 14, 1909.

939,869. Patented Nov. 9. 1909.

'1 SHEETS-SHEET 3.

P. W. SEYBOTH. MECHANICAL STOKER r011 FURNACES.

APPLICATION FILED MAY 14, 1909.

Patented Nov. 9, 1909.

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P. W. SEYBOTH. MEGHANIGAL STOKER FOR FURNACES. APPLIGATION FILED MAY 14,1909.

939,869. Patented Nov. 9, 1909.

7 SHEETS-SHEET 6.

Jnvshiar: FR\EDR\CHWI LHE-LMSEYBDTH iuunsw. a. Gnnwl conmdu'rnounmill.WASHINGTON. u c

P. W. SE'YBOTH. MECHANICAL STOKER FOR FURNACES.

APPLIOATION FILED MAY 14, 1909.

939,869. Patented Nov. 9. 1909.

7 SHEETS-SHEET "I.

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FRIEDRICH VIILHELIVI SEYBOTI-I, OF Z'WICKAU, GERMANY.

MECHANICAL STOKEB FOR FURNACES.

ceases.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application filed May 14, 1909. Serial No. 496,041.

To all whom it may concern:

Be it known that I, Fninnnrorr NILHELM SEYBOTI-i, a subject of theGerman Emperor, and resident of Zwickau, in Saxony, Germany, haveinvented a certain new and useful Improvement in Mechanical Stokers forFurnaces, of which the following is a specification.

In order to obtain a variable throw of the fuel with mechanical stokingdevices for furnaces with swinging shovels, it has been proposed toemploy irregular cam disks by which a tappet keyed on the shovel shaftwas pressed aside against the action of the shovel tension spring. Forthe sake of rigidity,the number of tappets on the cam disk couldnotexceed three, so that, with such construction, only three differentlengths of throw could be obtained. \Vith such an arrangement, uniformdistribution of the fuel on the grate, for all sizes of grates and forall kinds of fuel, cannot be obtained; on the contrary,numerousvariations in the length of throw are necessary, especially forsmall coal and long grates. This desirable result is obtained, in thepresent invention, by the arrangement of a lever swinging slowly aboutthe actuating shaft of the mechanical stoking device, the means foractuating the shovels being mounted in one arm of said lever.

The invention is illustrated by way of eX- ample in the accompanyingdrawings in which Figures 1 and 1 illustrate the complete apparatus inpart vertical section, the Fig. 1 being a continuation of Fig. 1; Fig. 2is a section on line 22 of Fig. 1; Fig. 3 is a vertical. section throughthe breaking rolls and shovel actuating mechanism; Fig. t shows,diagrannnatically, an end view of the shovel actuating mechanism in twodifferent positions. Fig. 5 shows, diagrammatically, the breaking rollactuating mecahnism; Fig. 6 is a section on line 66 of Fig. 1, and Fig.7, a side view showing the stoker applied to a furnace.

In the dust-tight casing, 1, is mounted the driving mechanism both forthe shovel actuating shaft, 2, and for the shaft, 3, of the breakingroll. The actuation is eifectec from the outside by means of a beltpulley, 100 (Fig. 1) which can be connected by a clutch, 6, with thepinion, 4: within the dusttight casing. This pinion (4) is mountedloosely on the breaking-roll shaft, 3, and is engaged by a gear, 5,(Figs. 1 and 3) which is itself keyed on a sleeve, 7, rotatable on theshovel actuating shaft, 2. By means of external actuating mechanism,after engagement of the clutch 6, the gears, a, 5 and the bush orsleeve, 7, are rotated.

A. pinion, 8, of the shovel actuating shaft is firmly connected with androtatable by the bush 7 (Fig. 3). Said pinion, 8, engages a pinion 9(Figs. 2 and 4) to which a cam, 10, is firmly bolted. Both the pinion,8, and the cam are keyed on a pin, 11, and are pivotally mounted inouter free ends of the double levers, 12, which latter are arranged (seeFig. 3) pivoted at opposite sides of the gear 8. One lever freely rockson the sleeve 7 the other freely rocks on the shaft 2. Alternatively,the pin 11 may be non-rotatably mounted in the outer free ends of thelevers 12, while the pinion 9 and the cam disk are rotatable about thepin 11. A slow oscillatory or swinging motion is imparted to the doublelevers 12, by means of a link, 13, controlled by an eccentric, 99, whichis mounted on the breaking roll shaft, The shovel 14 is keyed directlyon the shovel actuating shaft, 2, and is controlled by tension springs,15 (Fig. 1 which normally hold the shovelactuating shaft in the positioncorresponding to the least tension on the spring. On the shovelactuating shaft, 2, tappet, 16 (Figs. 2, 3 and 4:), is keyed, and, onrotation of the pinions S and 9, the tappet is raised by the cam disk 10in such manner that the springs, 15, are stretched, while, after passageof the eccentric or cam, 10, over the tappet 16, said tappet, and alsothe shovel-actuating shaft 2 and the shovel l i, are brought quicklyback, under the action of the springs 15, to initial positions. Eachrevolution of the pinion 9 and the cam disk 10, assures a singlemovement of the shovel.

Referring to the variation of movement of the shovel, it is obvious thatif the double levers 12 were held in one position, the tappet 16 wouldbe repeatedly raised to the same extent, and the tension springs 15would each time be stretched by the same amount, 2'. e. the length ofthrow of the shovel would be the same. However, by gradual alteration ofthe position of the levers, 12, and of the pin 11 carried thereby, thecam disk 10 is caused to come in contact with the tappet 16 earlier orlater, so that the tappet is raised more or less, the tension springs 15thus being correspondingly, more or less, ex

tended. The lo FSt position of the link 13, imparting the rising andfalling motion to the double levers 12, is shown in full lines in F ig.at. In this position the cam disk 10 is in its highest position and inclosest proximity to the tappet 16, so that on rotation it immediatelyengages with the tappet 16 and raises it to the greatest extent, thetension springs 15 being, under such circumstances, subjected to maximumstress.

The highest position of the eccentric 99 (and of link 13) is shown indotted lines in the same Fig. 4, at which time the cam disk 10 is in thelowest position, and, upon rotation of gear 9, comes in contact with thetappet 16 very late, so that the tappet is raised only a slightdistance, the tension springs 15 being stretched only slightly.Corresponding to the intermediate positions of the eccentric 99 betweenthe highest (dotted) position and the lowest (full) position (Fig. 4t)the tappet 16 is raised to different extents, and the tension spring 15is also correspondingly stretched.

The rising and falling movement, or oscillation, of the double levers12, and of gear 9, is, of course, quite slow, and for this purpose slow,intermittent rotation is given to the shaft 3 and eccentric 99. This iscontrolled by the gears al and 5, sleeve 7, eccentric 89 (Figs. 3 and 5)keyed to said sleeve, link 17, and pawl 18 controlled by spring 90. Saidpawl, upon the downward movements of the link 17, engages the ratchetteeth of gear 19, keyed on the shaft 3, thus contributing shortmovements thereto and to the cocentric 99, link 13 and double levers 12(Fig. at). The upper end of the link 17 (Fig. 5) is pivotally connectedwith a lever arm 88 which is sleeved upon the shaft 3.

In order to vary the extent of motion given to the gear 19 (and therebycontributed to shaft 3, link 13, levers 12 and cam 10), the duration ofengagement of that ratchet wheel by the pawl 18 is limited and regulatedby a cap, 20, carried upon one arm of a lever 21, the position of whichis determined by sliding a bar 22 and locking the notches of the same.hen the bar 22 is completely shoved in, the cap 20 is entirely out ofthe path of the pawl 18, and the maximum movement is given to gear 19;when said bar is fully pulled out, the cap delays the action of saidpawl so that only a short movement is given to gear 19. The position ofthe cap, 20, determines the ratio of movement of sleeve 7 and shaft 3.If, for example, the transmission ratio between the shovel actuatingmechanism 8, 9 on the one hand and the breaking roll shaft 3 on theother, is 7 0:1, on one lift of the eccentric 99 which is keyed on theshaft 3, thirtyfive rotations of the cam disk 10, that is, thirty-fiveseparate movements of the shovels 14 take place. Each movement of ashovel occurs at a difier'ent position of the double levers 12; by thismeans, for a single rotation of the breaking roll 3, thirty-five lengthsof throw are obtained.

. I claim:

1. A mechanical stoker for furnaces, comprising, in combination, aspring actuated shovel-actuating shaft, a shovel operable thereby, adouble-armed lever, a rotatable pinion carried by said lever, a cam diskrigidly connected with said pinion and carried by the lover, a tappetkeyed to said shovel-actuating shaft and engageable by the cam disk, anda driving pinion meshing with that first-named.

2. A mechanical stoker for furnaces, comprising, in combination, aspring actuated shovel-actuating shaft, a shovel operable thereby, adouble-armed lever, a rotatable pinion carried by said lever, a cam diskrigidly connected with said pinion and carried by the lever, a tappetkeyed to said shovel-actuating shaft and engageable by the cam disk, adriving pinion meshing with that first-named, and means for slowlyrocking said double-armed lever.

3. A mechanical stoker for furnaces, comprising, in combination, ashovel-actuating shaft, a double-armed lever mounted to rock around thesaid shaft, a pinion rotatably carried by said lever, a cam disk rigidlyconnected with said pinion, a tappet keyed to said shaft and engageableby the cam disk, a pinion rotatable around said shaft and meshing withthe pinion carried by the lever, a breaking-roll shaft, and meanscarried by the latter shaft for rocking the doublearmed lever.

1. A mechanical stoker for furnaces, comprising, in combination, aspring-actuated shovel-actuating shaft, a shovel operable thereby, asleeve rotatable on said shaft, 21 double-armed lever mounted to rock onsaid shaft, a rotatable pinion carried by said lever, a cam diskconnected with said pinion and carried by the lever, a tappet keyed tosaid shovel-actuating shaft and engageable by the cam disk, a pinioncarried by the sleeve mentioned and meshing with the pinion carried bythe lever, an eccentric carried by the sleeve, a link operated by saideccentric, a second shaft, a gear wheel fixed thereon, a pawl carried bysaid link for engagement with the last-named gear, an eccentric rigidlymounted 011 the second shaft, and a link operated by said eccentric andconnected with the double-armed lever.

FRIEDRICH WILHELM SEYBOTH.

Witnesses \VILLIAM J. KoUJE'rsEN VIoGo TVERSEN.

